Here's some ideas about the Repository Processing Note:
"Repository Processing Note" is unclear, in the SIEWG recommendations, we suggested that we call it the Internal Repository Note (or something explicitly with the word "internal")
The Internal Repository Note should be indexable for searching in the staff interface
It would be nice if there was a report or special view for someone to see all Internal Repository Notes associated with a given collection. This view would be similar to looking at all of the top containers, as a list. The Internal Repository Note would be visible with the archival object title and instance information.